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<li>&#x7F13;&#x5B58;&#x4E00;&#x81F4;&#x6027;&#x534F;&#x8BAE;&#xFF08;MESI&#x534F;&#x8BAE;&#xFF09;&#xFF1A;&#x5728;cpu&#x67B6;&#x6784;&#x4E2D;&#x5B58;&#x5728;3&#x7EA7;&#x7F13;&#x5B58;&#x673A;&#x5236; (&#x5728;&#x591A;&#x6838;CPU&#x7684;&#x7ED3;&#x6784;&#x4E2D;&#xFF0C;L1&#x548C;L2&#x662F;CPU&#x79C1;&#x6709;&#x7684;&#xFF0C;L3&#x5219;&#x662F;&#x6240;&#x6709;CPU&#x6838;&#x5FC3;&#x5171;&#x4EAB;&#x7684;&#xFF09;&#xFF0C;&#x7F13;&#x5B58;&#x662F;&#x4EE5;&#x7F13;&#x5B58;&#x884C;&#x7684;&#x5355;&#x4F4D;&#xFF08;&#x4E00;&#x822C;&#x662F;64bit&#xFF09;&#x7F13;&#x5B58;&#x8D77;&#x6765;&#x7684;&#xFF0C;&#x800C;&#x5728;&#x591A;&#x7EBF;&#x7A0B;&#x4E2D;&#xFF0C;&#x5982;&#x679C;&#x591A;&#x4E2A;&#x7EBF;&#x7A0B;&#x540C;&#x65F6;&#x66F4;&#x65B0;&#x7684;&#x6570;&#x636E;&#x5728;&#x540C;&#x4E00;&#x4E2A;&#x7F13;&#x5B58;&#x884C;&#x4E2D;&#xFF0C;&#x4F1A;&#x5BFC;&#x81F4;&#x7F13;&#x5B58;&#x884C;&#x89E6;&#x53D1;&#x591A;&#x6B21;&#x7684;&#x6570;&#x636E;&#x66F4;&#x65B0;&#x901A;&#x77E5;&#xFF0C;&#x591A;&#x4E2A;&#x7F13;&#x5B58;&#x90FD;&#x9700;&#x8981;&#x66F4;&#x65B0;&#x65B0;&#x503C;&#x4ECE;&#x800C;&#x5BFC;&#x81F4;&#x6548;&#x7387;&#x964D;&#x4F4E;&#xFF0C;&#x56E0;&#x6B64;&#x53EF;&#x4EE5;&#x5BF9;&#x591A;&#x7EBF;&#x7A0B;&#x64CD;&#x4F5C;&#x7684;&#x53D8;&#x91CF;&#x8FDB;&#x884C;&#x8BA4;&#x4E3A;&#x7684;&#x524D;&#x540E;&#x6DFB;&#x6EE1;64bit&#x5B57;&#x8282;&#x4F18;&#x5316;&#x8FD9;&#x79CD;&#x60C5;&#x51B5;&#x3002;</li>
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<li><p>&#x5728;DCL&#x53CC;&#x91CD;&#x68C0;&#x67E5;&#x5355;&#x4F8B;&#x4E2D;: </p>
<pre><code>public class Singleton {
    private volatile static Signle instance  = null;

    public static Singleton getInstanle() {
        if (instance == null) {
            synchronized (Singleton.class) {
                if (instance == null) {
                    instance = new Singleton();
                }
            }
        }
        return instance;
    }
}
</code></pre><p>&#x5176;&#x4E2D;volatile&#x5C31;&#x662F;&#x9632;&#x6B62; instance=new Singleton() &#x8FD9;&#x6761;&#x8BED;&#x53E5;&#x7684;&#x91CD;&#x6392;&#x5E8F;&#xFF0C;&#x7531;&#x4E8E;&#x5728;java&#x4E2D;&#xFF0C;&#x7C7B;&#x7684;&#x521D;&#x59CB;&#x5316;&#x88AB;&#x5206;&#x4E3A;3&#x4E2A;&#x6307;&#x4EE4;&#xFF0C;1&#x662F;&#x5206;&#x914D;&#x5BF9;&#x8C61;&#x5185;&#x5B58;&#x5927;&#x5C0F;&#xFF0C;2&#x662F;&#x8C03;&#x7528;&#x5BF9;&#x8C61;&#x7684;&#x521D;&#x59CB;&#x5316;&#x6784;&#x9020;&#x65B9;&#x6CD5;&#xFF0C;3&#x662F;&#x5C06;&#x5BF9;&#x8C61;&#x7684;&#x5730;&#x5740;&#x5F15;&#x7528;&#x8D4B;&#x503C;&#x7ED9;instance&#x8FD9;&#x4E2A;&#x53D8;&#x91CF;&#xFF0C;&#x800C;&#x5728;&#x591A;&#x7EA7;&#x6D41;&#x6C34;&#x7EBF;&#x4E2D;&#xFF0C;cpu&#x4E3A;&#x4E86;&#x63D0;&#x9AD8;&#x6548;&#x7387;&#xFF0C;&#x53EF;&#x4EE5;&#x540C;&#x65F6;&#x8FDB;&#x884C;&#x5BF9;&#x8C61;&#x521D;&#x59CB;&#x5316;&#x548C;&#x5F15;&#x7528;&#x5730;&#x5740;&#x8D4B;&#x503C;&#xFF0C;&#x56E0;&#x6B64;2&#x3001;3&#x4E24;&#x6761;&#x6307;&#x4EE4;&#x662F;&#x6709;&#x53EF;&#x80FD;&#x6267;&#x884C;&#x987A;&#x5E8F;&#x4E0D;&#x4E00;&#x81F4;&#xFF0C;&#x5BFC;&#x81F4;3&#x5148;&#x6267;&#x884C;&#xFF0C;&#x800C;&#x8FD9;&#x4E2A;&#x65F6;&#x5019;&#x4E0B;&#x4E00;&#x4E2A;&#x7EBF;&#x7A0B;&#x83B7;&#x53D6;&#x8BE5;&#x5355;&#x4F8B;&#x65F6;&#x4F1A;&#x83B7;&#x53D6;&#x5230;&#x4E00;&#x4E2A;&#x8FD8;&#x6CA1;&#x6709;&#x8D70;&#x5B8C;&#x521D;&#x59CB;&#x5316;&#x65B9;&#x6CD5;&#x7684;&#x5BF9;&#x8C61;&#x5BFC;&#x81F4;&#x5BF9;&#x8C61;&#x9003;&#x9038;&#xFF0C;&#x800C;&#x52A0;&#x4E86;volatile&#x540E;&#xFF0C;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x4FDD;&#x8BC1;2&#x3001;3&#x6307;&#x4EE4;&#x4E0D;&#x4F1A;&#x88AB;&#x91CD;&#x6392;&#xFF0C;&#x9632;&#x6B62;&#x8FD9;&#x79CD;&#x60C5;&#x51B5;&#x53D1;&#x751F;&#x3002;</p>
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